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(a) "Volvox and flow field generated by beating cilia (DAMTP, Biological Fluids)"

Composite of the following two images:

http://www.damtp.cam.ac.uk/user/gold/pix/volvox_darkfield.jpg

http://www.damtp.cam.ac.uk/user/gold/pix/volvox_stick.jpg

Edits: Images cropped and resized to fit 883 x 431 carousel template.

(b) "Vortex ring impinging on fresh/salt water interface (MUST)"

Image provided by Jason Olsthoorn (DAMTP). Further information on the experiments may be found in the following paper:

Olsthoorn, J. and S.B. Dalziel (2015) Vortex-ring-induced stratified mixing. J. Fluid Mech. 781, 113-126.

Fluids themes

http://www.engr.wisc.edu/ep/newsletter/2003_springsummer/article01_turbulence.html

A Deluge, with a Falling Mountain and Collapsing Town (c. 1515), Leonardo da Vinci

Edits: Cropped, hue adjusted, resized.

Applications

https://commons.wikimedia.org/wiki/File:Smoke_plume_from_chimney_of_power_plant.jpg

Smoke plumes from chimneys of a power plant in Helsinki, Finland. Author: Pöllö.

Edits: Cropped, resized.

Techniques

http://www.jstor.org/stable/109431

Reynolds, O. (1883) "An Experimental Investigation of the Circumstances Which Determine Whether the Motion of Water Shall Be Direct or Sinuous, and of the Law of Resistance in Parallel Channels." Phil. Trans. R. Soc. Lond. 174, 935-982. Figure 13.

Edits: cropped, figure isolated, contrast adjusted, resized.